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Homestake Mining Company

Uranium-Radium-Vanadium Ores, Sargents, Colorado. NPDES permit CO0022756 expired Dec 31, 2014; its limits still apply. Last 12 months: no values over a limit, 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (8 values), form Q quarterly (9 values), form X quarterly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 6 required values missing, 3 of 20 reports late

Limits in force (27)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Zinc, potentially dissolved30-day average≤ 500 ug/Lall year
Zinc, potentially dissolveddaily maximum≤ 1000 ug/Lall year
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year
Radium 226, dissolved30-day average≤ 3 pCi/Lall year
Radium 226, dissolveddaily maximum≤ 10 pCi/Lall year
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year
Radium 226 + radium 228, totaldaily maximumreport only (pCi/L)all year
Uranium, total30-day average≤ 2000 ug/Lall year
Uranium, totaldaily maximum≤ 4000 ug/Lall year
Flow, in conduit or thru treatment plant30-day average≤ 2.6 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Toxicity [chronic], Ceriodaphnia dubiasingle samplereport only (tox chronic)all year
Toxicity [chronic], Ceriodaphnia dubiaminimum valuereport only (tox chronic)all year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]single samplereport only (tox chronic)all year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]minimum valuereport only (tox chronic)all year
Solids, total dissolvedquarterly averagereport only (mg/L)all year
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum valuereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum valuereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum value≥ 100 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelassingle samplereport only (%)all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum valuereport only (%)all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum value≥ 100 %all year

How strict are these limits?

Cited limits by parameter: Colorado's rules and the federal ones.

Same industry: the 30 Metal Mining permits in Colorado.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CO0022756 · MCP: https://passage-data.com/mcp